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In the crystal structure of the title compound, C 22 H 17 BrO 6 , the quinone ring makes a dihedral angle of 81.84 (3)° with the benzene ring. The chiral C atoms,  viz.  the ring C atoms bearing the hydr­oxy and bromo­phenyl substituents, exhibit  R  and  S  configurations, respectively. The terminal ethyl group of the –CO 2 CH 2 CH 3  group is disordered over two sets of sites with site-occupancy factors of 0.64 (1) and 0.36 (1). Inter­molecular O—H⋯O inter­actions further stabilize the crystal packing.

Ethyl (2S,4R)-4-(4-bromophenyl)-2-hydroxy-5,10-dioxo-3,4,5,10-tetrahydro-2H-benzo[g]chromene-2-carboxylate